Author Topic: Ever wondered what the difference in decibles a stock disco vs disco with a TKO (Read 731 times)

djdilliodon · « **on:** February 01, 2012, 08:04:31 PM »

Well I did and yes I tested it! I've been into car audio for many years and years back I purchased a spl meter. Haven't used it in some time but thought this would be an excellent thing to test. I shot my stock disco both with and without the tko 5 times each at 3ft away from the mic. The results where no tko averaged 104db and with averaged 98db. A total of a 6db decrease in sound! For those that may not know that is percieved by the human ear as 4 times louder with no tko!

mustangmike · « **Reply #1 on:** February 01, 2012, 09:56:26 PM »

Very cool info

Now you need to test a disco with a fully shrouded barrel.. I'm interested in how much of a difference a shroud makes vs a tko

Snaab9-2 · « **Reply #2 on:** February 01, 2012, 10:26:24 PM »

Excellent information! Thanks for sharing.

Can you test it with a heavier hammer spring with and without the TKO too? I am curious how much lounder it is at around 29 FPE vs the stock power levels.

djdilliodon · « **Reply #3 on:** February 01, 2012, 10:34:55 PM »

Quote from: Snaab9-2 on February 01, 2012, 10:26:24 PM

Excellent information! Thanks for sharing.

Can you test it with a heavier hammer spring with and without the TKO too? I am curious how much lounder it is at around 29 FPE vs the stock power levels.

I don't have a heavier hammer spring for it or I would test it. My disco will remain stock power wise till I get 1000 pellets down the barrel. After 2 tins of the jsb 15.9's it will get the mac1 treatment and I'll def test it again.

djdilliodon · « **Reply #4 on:** February 01, 2012, 10:39:51 PM »

Quote from: mustangmike on February 01, 2012, 09:56:26 PM

Very cool info

Now you need to test a disco with a fully shrouded barrel.. I'm interested in how much of a difference a shroud makes vs a tko

I would love to do that test but don't have access to one with a full shroud

. IMO one with a full shroud would have to be at least 3db quiter than the tko to be worth it. Less than 3db it would be a waste to go with a full shroud. Now if a full shroud is over 3db quiter, than its totally worth it in my book!

mustangmike · « **Reply #5 on:** February 02, 2012, 12:14:52 AM »

That's what I'm trying to figure out, I love the shrouded look but with their price tags of $100+ I want to be sure it will be better then the tko

Lambchops · « **Reply #6 on:** February 02, 2012, 12:18:44 AM »

Kinda disappointed... My Stoeger X20 S .22 is supposed to be near 80 Db, and that still echos in my yard. It's not loud, but my neighbors can still hear it. How far away was this "instrument" from the muzzle? and which direction was it facing in regards to the instrument you were using?

rsterne · « **Reply #7 on:** February 02, 2012, 12:34:25 AM »

I tried a dB meter recently and it wouldn't reliably record the sound of the shot.... I think the "sampling rate" was too low so I returned it....

Bob

rkr · « **Reply #8 on:** February 02, 2012, 01:25:38 AM »

Here's one test

http://www.youtube.com/watch?v=Dp3vslhEBSY&feature=channel_video_title
	Small \| Large

If that holds the TKO is a bit loud. Personally I haven't noticed much difference in sound level whether I use my HW "moderator" on a 12 fpe .177 or 32 fpe .22.

djdilliodon · « **Reply #9 on:** February 02, 2012, 08:56:37 AM »

Quote from: Lambchops1493 on February 02, 2012, 12:18:44 AM

Kinda disappointed... My Stoeger X20 S .22 is supposed to be near 80 Db, and that still echos in my yard. It's not loud, but my neighbors can still hear it. How far away was this "instrument" from the muzzle? and which direction was it facing in regards to the instrument you were using?

IMO your x20 S I would imagine would be at least in the 90 db range. The noise of the spring twang alone is got some volume. The mic I had setup 3ft away from the muzzle along with the muzzle being 2ft higher than the mic. I also did my testing dry firing so it would be the loudest. When I get home today I'll test the tko again with a pellet firing to see the difference. I will also test my stoeger x10 to compare.

N.E.Dan · « **Reply #10 on:** February 02, 2012, 09:52:25 AM »

Quote from: djdilliodon on February 01, 2012, 08:04:31 PM

The results where no tko averaged 104db and with averaged 98db. A total of a 6db decrease in sound! For those that may not know that is percieved by the human ear as 4 times louder with no tko!

That's sounds right to me. I'm not sure what effect the TKO has on other guns but it was extremely noticeable on my Disco. It went from No Way, to Usable in my back yard. Full, it kinda sounds like the farting you get when it's time to refill.
It is quieter than my P-rod that comes shrouded.

gamo2hammerli · « **Reply #11 on:** February 02, 2012, 12:22:07 PM »

Great info and that's quite a reduction in noise.

crowpopper · « **Reply #12 on:** February 02, 2012, 01:14:51 PM »

Need to get a meter and test my gun. I know it is quieter than my 2240 with tko. I have a roy kasten full shroud

breakfastchef · « **Reply #13 on:** February 02, 2012, 05:44:08 PM »

I can also confirm the quieting factor of TKO muzzle brakes. On a 1377 carbine configuration with 18" barrel, I saw a solid 10dB drop in SPL using a 6.5" TKO muzzle break.

djdilliodon · « **Reply #14 on:** February 02, 2012, 06:19:31 PM »

I did a retest on my disco this time shooting a pellet. I got an average of just 93db! I also tested my stoeger x10 and that was averaging 96 db. That means the stoeger is perceived by the human ear as twice as loud as the disco with tko.

Lambchops · « **Reply #15 on:** February 02, 2012, 06:39:11 PM »

Quote from: djdilliodon on February 02, 2012, 06:19:31 PM

I did a retest on my disco this time shooting a pellet. I got an average of just 93db! I also tested my stoeger x10 and that was averaging 96 db. That means the stoeger is perceived by the human ear as twice as loud as the disco with tko.

Thanks! You answered my questions.

CitySniper · « **Reply #16 on:** February 02, 2012, 07:17:34 PM »

Yeah...PCP rifles are always quieter when you shoot pellets rather than just air.

Lambchops · « **Reply #17 on:** February 03, 2012, 07:14:07 AM »

If a Stoeger X10 is 96 db, and a Disco with 6.5" TKO is 93 db, then is it safe to say a Stoeget X20 S is quieter than both?!

Wheelman88 · « **Reply #18 on:** February 03, 2012, 07:19:40 AM »

Thank you for the info.Very intresting.

djdilliodon · « **Reply #19 on:** February 03, 2012, 09:19:46 AM »

Quote from: Lambchops1493 on February 03, 2012, 07:14:07 AM

If a Stoeger X10 is 96 db, and a Disco with 6.5" TKO is 93 db, then is it safe to say a Stoeget X20 S is quieter than both?!

It is possible that the x20 S is quiter but I wouldn't consider it as a fact. With a springer you have 3 things against you when it comes to noise. One is the air forcing the pellet out the barrel. This can be reduced with a brake or suppressor designed to do so. The second thing you have is the spring twang itself. No brake or suppressor is going to quite this down. Finally the third thing is deisling (sp? it's early lol). When that happens no brake or suppressor is going to quite a shot when that happens. Basically what it comes down to with a springer is if the twang is loud by itself, then a brake or suppressor is only going to solve half the problem. If I was able to totally eliminate the noise of just the air from my x10, I bet just the twang from the spring would be 90+ db. When I get home today I will wrap a few towels over the Barrel of my x10 and test to see how loud just the twang is. On a side note when I bought my x10 I almost got the x20 S but didn't wanna spend the cash at the time. I wish I did cause I'm so curious to test one!